matlab使用pitchshift()函数对语音信号进行变调处理

在Matlab中，可以使用pitchshift()函数对语音信号进行变调处理。该函数在Signal Processing Toolbox中提供。要使用pitchshift()函数，可以按照以下步骤进行：

1. 读取原始语音信号文件，并将其转换为数字信号数据。

2. 将数字信号数据传递给pitchshift()函数，并指定要变化的音高或音调的值。

3. 将pitchshift()函数返回的变化后的数字信号数据保存到新的文件中。

下面是一个Matlab示例代码，演示如何使用pitchshift()函数对语音信号进行变调处理：

% 读取原始语音信号文件
[audio, Fs] = audioread('original_voice.wav');

% 将数字信号数据传递给pitchshift()函数，并指定要变化的音高或音调的值
pitch_shift = 3; % 将音高升高3个半音
audio_shifted = pitchshift(audio, Fs, pitch_shift);

% 将pitchshift()函数返回的变化后的数字信号数据保存到新的文件中
audiowrite('shifted_voice.wav', audio_shifted, Fs);

在上面的代码示例中，我们使用了Matlab中的audioread()函数读取原始语音信号文件，使用pitchshift()函数对信号进行音高变化，然后使用audiowrite()函数将变化后的数字信号数据保存到新的文件中。

相关问题

MATLAB语音变调变速

MATLAB是一种强大的数学软件，广泛应用于工程和科学计算中。它也提供了丰富的工具箱来处理音频和语音信号。语音变调和变速是语音处理中的两个重要功能，可以通过MATLAB轻松实现。

### 语音变调
语音变调是指改变语音信号的音调而不改变其速度。实现语音变调通常涉及以下步骤：

1. **读取语音信号**：使用`audioread`函数读取音频文件。
2. **短时傅里叶变换（STFT）**：将语音信号分解成短时帧，并对每一帧进行傅里叶变换。
3. **频谱移位**：根据所需的变调因子，对频谱进行移位。
4. **逆短时傅里叶变换（ISTFT）**：将移位后的频谱转换回时域信号。
5. **写入语音信号**：使用`audiowrite`函数将变调后的语音信号保存为音频文件。

### 语音变速
语音变速是指改变语音信号的速度而不改变其音调。实现语音变速通常涉及以下步骤：

1. **读取语音信号**：使用`audioread`函数读取音频文件。
2. **重采样**：根据所需的速度因子，对语音信号进行重采样。
3. **时间缩放**：使用时间缩放算法（如相位声码器）来保持音调不变。
4. **写入语音信号**：使用`audiowrite`函数将变速后的语音信号保存为音频文件。

### 示例代码
以下是一个简单的示例代码，展示了如何在MATLAB中实现语音变调和变速：

% 读取语音信号
[y, fs] = audioread('input.wav');

% 语音变调
pitchShift = 2; % 变调因子
y_pitchShifted = pitchShift(y, fs, pitchShift);

% 语音变速
speedFactor = 1.5; % 速度因子
y_speedChanged = speedChange(y, fs, speedFactor);

% 写入变调后的语音信号
audiowrite('output_pitchShifted.wav', y_pitchShifted, fs);

% 写入变速后的语音信号
audiowrite('output_speedChanged.wav', y_speedChanged, fs);

% 语音变调函数
function y_pitchShifted = pitchShift(y, fs, shift)
    y_pitchShifted = interp(y, 2^shift, 'spline');
end

% 语音变速函数
function y_speedChanged = speedChange(y, fs, factor)
    y_speedChanged = resample(y, factor, 1);
end

基于matlab gui写一段实现语音倍速和变调的代码

以下是一个简单的MATLAB GUI程序，用于实现语音倍速和变调的功能。该程序使用MATLAB内置的函数实现这些功能，包括`resample`和`pitchshift`。

function varargout = audio_speed_pitch_gui(varargin)
% AUDIO_SPEED_PITCH_GUI MATLAB code for audio_speed_pitch_gui.fig
%      AUDIO_SPEED_PITCH_GUI, by itself, creates a new AUDIO_SPEED_PITCH_GUI or raises the existing
%      singleton*.
%
%      H = AUDIO_SPEED_PITCH_GUI returns the handle to a new AUDIO_SPEED_PITCH_GUI or the handle to
%      the existing singleton*.
%
%      AUDIO_SPEED_PITCH_GUI('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in AUDIO_SPEED_PITCH_GUI.M with the given input arguments.
%
%      AUDIO_SPEED_PITCH_GUI('Property','Value',...) creates a new AUDIO_SPEED_PITCH_GUI or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before audio_speed_pitch_gui_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to audio_speed_pitch_gui_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help audio_speed_pitch_gui

% Last Modified by GUIDE v2.5 12-Nov-2021 16:14:21

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @audio_speed_pitch_gui_OpeningFcn, ...
                   'gui_OutputFcn',  @audio_speed_pitch_gui_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT


% --- Executes just before audio_speed_pitch_gui is made visible.
function audio_speed_pitch_gui_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to audio_speed_pitch_gui (see VARARGIN)

% Choose default command line output for audio_speed_pitch_gui
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes audio_speed_pitch_gui wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = audio_speed_pitch_gui_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;


% --- Executes on button press in open_file_button.
function open_file_button_Callback(hObject, eventdata, handles)
% hObject    handle to open_file_button (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Open file dialog and get file path
[filename, pathname] = uigetfile({'*.wav'}, 'Select a WAV file');
if isequal(filename,0) || isequal(pathname,0)
    return;
end
filepath = strcat(pathname, filename);
set(handles.file_path_text, 'String', filepath);

% Load audio file
[audio_data, sample_rate] = audioread(filepath);
handles.audio_data = audio_data;
handles.sample_rate = sample_rate;

% Update GUI
set(handles.sample_rate_text, 'String', sprintf('%d Hz', sample_rate));
set(handles.duration_text, 'String', sprintf('%.2f seconds', length(audio_data) / sample_rate));
set(handles.speed_slider, 'Value', 1.0);
set(handles.pitch_slider, 'Value', 0.0);
plot_audio(handles.audio_data, handles.sample_rate, handles.axes1);

% Update handles structure
guidata(hObject, handles);


% --- Executes on slider movement.
function speed_slider_Callback(hObject, eventdata, handles)
% hObject    handle to speed_slider (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get current slider value
speed = get(hObject, 'Value');

% Resample audio data to change speed
new_sample_rate = round(handles.sample_rate * speed);
new_audio_data = resample(handles.audio_data, new_sample_rate, handles.sample_rate);

% Update GUI
set(handles.sample_rate_text, 'String', sprintf('%d Hz', new_sample_rate));
set(handles.duration_text, 'String', sprintf('%.2f seconds', length(new_audio_data) / new_sample_rate));
plot_audio(new_audio_data, new_sample_rate, handles.axes2);

% Update handles structure
handles.speed = speed;
handles.new_audio_data = new_audio_data;
handles.new_sample_rate = new_sample_rate;
guidata(hObject, handles);


% --- Executes during object creation, after setting all properties.
function speed_slider_CreateFcn(hObject, eventdata, handles)
% hObject    handle to speed_slider (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Slider range and step size
set(hObject, 'Min', 0.5);
set(hObject, 'Max', 2.0);
set(hObject, 'SliderStep', [0.01, 0.1]);
set(hObject, 'Value', 1.0);


% --- Executes on slider movement.
function pitch_slider_Callback(hObject, eventdata, handles)
% hObject    handle to pitch_slider (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get current slider value
pitch = get(hObject, 'Value');

% Shift pitch of audio data
new_audio_data = pitchshift(handles.new_audio_data, handles.new_sample_rate, pitch);

% Update GUI
plot_audio(new_audio_data, handles.new_sample_rate, handles.axes2);

% Update handles structure
handles.pitch = pitch;
handles.new_audio_data = new_audio_data;
guidata(hObject, handles);


% --- Executes during object creation, after setting all properties.
function pitch_slider_CreateFcn(hObject, eventdata, handles)
% hObject    handle to pitch_slider (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Slider range and step size
set(hObject, 'Min', -12.0);
set(hObject, 'Max', 12.0);
set(hObject, 'SliderStep', [0.01, 0.1]);
set(hObject, 'Value', 0.0);


% --- Helper function to plot audio data on an axes object
function plot_audio(audio_data, sample_rate, axes_handle)
time = (0:length(audio_data)-1) / sample_rate;
plot(axes_handle, time, audio_data);
xlabel(axes_handle, 'Time (s)');
ylabel(axes_handle, 'Amplitude');

该程序包括一个GUI界面，可以选择一个WAV格式的音频文件，并使用滑动条实现语音倍速和变调功能。通过调用`resample`和`pitchshift`函数来实现这些功能。程序还包括一个辅助函数`plot_audio`，用于在GUI中的一个axes对象上绘制音频数据的波形图。

请注意，这只是一个简单的示例程序，可能需要根据您的需求进行修改和优化。